Forging device



June 27, 1939- D. w. HART ET AL.

FORGINGv DEVICE Filed Feb. 11, 19:58

di Ina/flle e fea l i:

THE IH' ATTORNEYr Patented June 27, 1939 UNITED` STATES PATENT OFFICEFORGING DEVICE New Jersey Wickens, Phil- Ingersoll-Rand N. J., acorporation of Application February 1`1, 1938, Serial No. 189,958

2 Claims.

This invention relates to forging devices, and more particularly to thearrangement of the dies used on drill sharpening machines for impartinga desired conformation on a blank, as for eX- ample the threads on adrill rod used in connection with detachable drill bits.

One object of the invention is to avoid imperfections in the forgedarticle.

Another object is to avoid the occurrence of error in the forged articleas a result of an erratic action by the forging machine when its partsbecome worn unduly.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is a side elevation of so much of the forging device and somuch of a drill Sharpener as will serve to illustrate the invention,

Figure 2 is a similar view, Somewhat enlarged, and broken away,

Figure 3 is a transverse View taken through Figure l on the line 3-3looking in the direction indicated bv the arrows, and

Figure 4 is a plan View taken through Figure 1 on the line 4-4.

Referring more particularly to the drawing, 20 designates a forging'machine shown as a drill Sharpener and comprises a base 2| and a head22 which is reciprocable in a vertical plane with respect to the base2l.

The drill Sharpener may be of a Well known type that is actuated bypressure fluid and has a cylinder 23 in the base to accommodate a piston24 which is connected to the head 22 by a rod or rods 25 slidable in thebase. The pressure fluid employed for actuating the piston 24 may bedistributed to the cylinder 23 by suitable valve mechanism 25 actuatedby a manually operable lever In accordance with the practice of theinvention, the base 2| is provided with a recess 28, in its uppersurface, to receive a die block 29 in the forni of a rectangular member.A locating pin 30, seated in the base 2|, engages the block 29 and aclamp plate 3| and a screw 32 serve to clamp the block 23 securely tothe base 2 I.

Within the die block 29 is a recess 33 of rectangular shape to receivetop and bottom threadforming dies 34 and 35, respectively. Both dies arefitted for slide movement in the recess 33 but withl sufcient accuracyto preclude misalignment of the dies with respect to the Side surfacesof the recess 33 whereby they are guided. In the confronting surfaces ofthe dies are depressions 35 which are developed to theform which it isintended to forge on the work, this being in the present instance, athread 3l on a rod 38.

To the endthat the top die 34 may be conveniently raised from the workbetween blows of the head 22 so that the rod 38 may be shifted todifferent positions the die 34 is provided at its ends with pins 39which are slidable in slots 40 in the sides of the die block 29. Thepins 39 eX- tend beyond the ends ofthe die block, and on the head 22 isa plate 4I which, during the reciprocations of the head 22, strikeagainst the top die 34 and carries a pair of lifters 42. The lifters arein the form of hooks lying on opposite sides of the die block 29 and ofsuch length that they will engage the-pins 39 at an intermediate pointin the up-stroke of the head for lifting the top die 34 from the work.

The plate 4l is preferably readily detachable from the head 22 and isaccordingly secured in position byr a clamp member 43 which is forcedagainst the plate 4l by a screw 44.

To the end that the rod 38 may be conveniently locked in the correctposition with respect to the forming dies, the drill Sharpener isequipped. with suitable chuck mechanism 45 supported by rods 4E carriedby the die block 29. The chuck 45 comprises a guide member 41 mounted onthe ends of thel rods 45 and having a bore 4B in. which is a thread 49-of the same lead as the thread 31 to engage the thread 5!! of a sleeve5l threaded into the bore 48.

The bore 52 within the sleeve 5! and through which the rod 3B extends isof somewhat larger diameter than the rod. and in order to maintain therod 38 coaxial with the forming portions of the dies a pair of rests 53are threaded into the sleeve 5! and extend into the bore 52 to supportthe rod 38. The rests 53 are readily adjustable to accommodate rods ofdifferent diameter and are locked in position by nuts 54 threaded on.the rests 53 and seating against the periphery of the sleeve 5|.' On theouter end of the rests 53 are grip members 55 which may be grasped forrotating the sleeve.

The sleeve is, moreover, provided with clamping screw 56 which may be areplica of the rests but lacks the lock nut 54. The screw 55 is likewiseprovided with a grip member 55 and Serves the function of locking therod 3B securely against the rests 53. Y

In the operation of the device, and assuming that the head 22 is in itsuppermost position i1lus trated in Figures 1, 2 and 3, the heated end ofthe rod is inserted through the sleeve 5I and disposed upon the bottomdie 35. The set screw 56 is then manipulated to clamp the rod securelyin position. 'Thereafter the valve 26 is shifted, by means of the lever2l, to admit pressure fluid into the cylinder 23 for actuating itdownwardly. During this movement of the piston the head 22 will strikeagainst the top die 34 and forge the threads 3'! on the rod. Afterdelivery of the blow to the top die the valve mechanism 25 is nextmanipulated to deliver pressure fluid beneath the piston 2li for raisingthe head 22.

During the upward movement of the piston and shortly before it reachesits uppermost limiting position the hooks 42 engage the pins 39 and liftthe top die 34 from the work. The rod 38 may then be rotated to a newposition on the bottom die 35 by rotating the sleeve 5 I. The valvemechanism 26 is then again operated to cause the piston 2li and the head22 to descend.

At an intermediate point in the descending movement of the head 22 thetop die 34 will contact the Work and remain there in readiness toreceive the blow of the head 22. This. operation is repeated as often asmay be required to complete the forging of the thread 31.

As will be readily observed from .the foregoing description there is nopermanent connection between the top die 34 and the element, in thepresent instance the head 22, whereby it is actuated. The top die isguided entirely by the die block7 and in View of these facts any tiltingor misalignment of the head 22 as a result of wear on the elementsguiding and supporting it will not be transmitted to the top die for thereason that the head is disengaged from the die 34 before the blow isdelivered against said die.

We claim: s

1. In a forging device, the combination of a Y base and a headreciprocable with respect to the base, a stationary bottom die in thebase, a top die to receive the blows of the head and being slidable inthe base, and lifters axed to the head to move into engagement with thetop die at an intermediate point in each alternate stroke of the headfor lifting the top die from the bottom die.

2. In a forging device, the combination of a base and a headreciprocable in a vertical plane with respect to the base, a stationarybottom die in the base, a top die to receive the blows of the head andbeing slidable in the base, lifters carried by the head to move intoengagement with the top die at an intermediate point in the stroke ofthe head for lifting the top die and to move out of engagement with thetop die during the descending movement of the head to deposit the topdie upon the work, and means to maintain the lifters constantly inposition to engage the top die.

DUDLEY W. HART. EDWARD F. WICKENS.

